Initial commit ISO/FDIS 19115-1:2013
Small enhancements to 2.10.x and trunk which allow parsing of this schema and indexing
(in particular for gml-3.2.1 metadata extents) to come shortly

Note:

- only works in classic editor for now
- some functions still to be checked
- no localization for languages other than english and locale breaks at present
- no labels for element names (this is deliberate as the aim here is to get familiar with ISO19115-1 changes)
- lots of editor functions have basic or no support at present

This is an initial commit - not working at present so don't plug it into your
production instance!